Ventilating-louver.



A. W. STEWART. `VENTILA'IING LOUVER. Arrmonron FILED SEPT. 2a, 190s.

Patented Feb. ,2, 1909.

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ji/LW A. W. STEWART.

VENTILATING LoUvBR. APPLICATION FILED SEPT. 23,1908. 91 1,457. PatentedFeb. 2, 1909.

2 SHEETS-SHEET 2.

@fm-'Y @M/a arfzey ALEXANDER WILLIAM STEWART, OF GLASGOW,- SGOTLAND'.

VENTILATING-Loutnn. y

l Specification of Lettera Patent.

Patented Feb. a', 190e.

Application ld September 23, 1908. Serial No. 454,411.

To alt whom it may concern.'

Be it known that I, ALEXANDER WILIJIAM STEWART, a subject of the King ofthe United Kingdom of- Great Britain and Ireland, and resid-ing atGlasgow, Scotland, have invented a certain new and useful Improvement inVentilating-Louvers, of which the following is a specification.

Tins invention relates to Ventilating louvers ofthe hit-and-miss typemore especially of the kind in which a detlecting plate is used todeflect the air through lthe ventilator openings in its passage alongthe air supply trunk or the like.

The primary object of the present invention is to provide means wherebythe deflecting plate is automatically controlledby the means forimparting movement to the vusual sliding plate of the louver eitherdirectly or through the intermediary of said sliding plate so thataccording to the degree of opening of the louver the deflector platecorrespondingly varies the resistance to the passage of the air alongthe trunk.

In the accompanying drawings Figure 1 is an elevation, Fig. 2 is atransverse section and Fig. 3 is a horizontal section of a louverembodying the invention. Fig. 3a is a horizontal section showing thelouver attached to the air supply trunk. Figs. 4, 5 and 6 are like viewsto Figs. l, 2 and 3 but show an alternative construction. U

In the preferred form shownin Figs. l to 3a, the louver which isattached to the air supply trunk A1 (Fig. 3a) has the defiecting plate Apivoted to it at one end on bracket arms B secured to the fixed frame ofthe louver, said fixed frame comprising two apertured` plates C, D, withan interposed frame d serving as a distance piece. To said defiectingplate A is attached a toothed quadrantor quadrants E adapted to gearwith a toothed rack or racks F on the apertured sliding plate G of thelouver which sliding plate G is mounted between the plates C, D, whichform an airtight joint with the sliding plate. The arrangement is suchthat when the louver is closed the defiecting plate A is in horizontalposition-and according to the degree of opening of the louver thedefiecting plate A is raised correspondingly.

lIn lieu of the detlecting plate A being operated b means of toothedquadrant and rack gear ,.F, equivalent devices may be employed toproduce the same result.

Any welll` known' devicel may be! 'employed to operate, and adjust the'lposition of, the slidingplate of thelouver; but preferabl a cam Hisemployed which cam is-adapted to work in conjunction witli a slot I inAthe sliding plate G, and is mountedbetween the fixed plates C, D, whichalso provide bearings for the ends of the cam spindle 71,; or the camvI-I may be fitted between a bridge piece and the plate D, said bridgepiece being secured' to the plate D and accommodated .in a slot in thelate' C. The outer end h1 of the cam s in lek' which may be fitted inany suitab e position is protected by a guard bearing J and is of squareor like section for engagement with a portable box key by which meansthe cam H and likeair tlght joint with the faces of the sliding plate G.The said sliding plate G is operated in the manner described above; butin lieu Vof the deflecting plate A being actuated l by movement of thesliding 'plate G, said deflecting plate A is secured after the manner ofa butterfly valve to the inner end of the spindle h which actuates thecam H or other device "for imparting movement to the sliding plate G -sothat on movement of the said spindle It, which in this construction is,fitted at one end of the louver, the deflecting plate A assumes aposition corresponding to that of the sliding plate G andcorrespondingly varies the resistance to the passage of the air alongthe supply trunk.

I-Iaving now described my invention what I claim and desire to secure byLetters Patent of the United States is 1. A Ventilating louver,hcomprising a stationary apertured member, a sliding apertured memberguided by said stationary member, and a deflector movable with saidlsliding member.

2. A Ventilating louver comprising a stationary apertured member asliding apertured member guided by said stationary member, a deflector,and means for moving said sliding member and said deiectorsimultaneously.

3. A ventilatin louvercomprising a stationary aperture member, a slidingapertured member guided by said stationary member, a deflector connectedto said fixed member y and movable with said sliding member. .L

4. A ventilatin louver comprising a stationary aperture member, asliding apertured member guided by said stationary 'membe'r a deflector,means operable to move said ing member, and devices for communicatingmovement from said sliding member to said deflector.

5. A Ventilating louver comprising a stationary apertured member, asliding apertured member ided by said stationary member, turnab e camdevices operable to move said sliding member, and a delector movablewith said sliding member.

6. A Ventilating louver comprising a staeinem tionary apertured member,a sliding apertured member guided by said stationary member, meansoperable to move said sliding member, a deector pivoted to saidstationary member and rack and sector gearing for communicating movementof said sliding member to said deector.

7 A Ventilating louver comprising two stationary apertured plates, anapertured plate slidable between said stationary plates, cam devicesoperable to move said sliding plate, a deector pivoted to one of saidstationary plates, and rack and Sector gearing for communicatingmovement of said sliding plate to said deflector.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

ALEXANDER WILLIAM STEWART.

Witnesses:

WALnAcE CRANSTON FAIRWEATHER, JOHN MCCLEARY.

